Question

我有一堆文件名。我需要从这些文件中一次读取一行，进行一些处理，然后再从这些文件中读取一行，进行一些处理等等。

我正在寻找有关如何以更加Pythonic方式执行此操作的建议。我知道每个文件中存在的行数，所以我现在很难编码，但我不想这样做。

更新：这些文件都有相同的行数。

UPDATE2：至少有30个不同的文件。

filenames = []
line_count = 400
fileobjs = [open(i, 'r') for i in filenames]
for i in xrange(line_count):
    lines = []
    for each_fo in fileobjs:
        for each_line in each_fo:
            lines.append(each_line)
            break
    process(lines)

Answer 1

这个怎么样？

from itertools import izip_longest
for file_lines in izip_longest(*map(open,filenames)):
    for line in file_lines:
        if line:
            # process line

Answer 2

lines = [next(fo) for fo in fileobjs]
process(lines)

Answer 3

这将一次读取两个文件

 with open('File1','r') as FileA, open('File2','r') as FileB:
     for lineA,lineB in zip(FileA,FileB):
          print lineA,lineB

Answer 4

filenames = []
files = [open(f, mode='r') for f in filenames]
for line in files[0]:
    lines = [file.readline() for file in files]
    process(lines)

从多个文件一次读取1行

4 个答案: